September weather forecast
Kelly, WY

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Weather in September

The first month of the autumn, September, is still a comfortable month in Kelly, Wyoming, with an average temperature varying between 37°F (2.8°C) and 62.1°F (16.7°C).

Temperature

The transition into September subtly indicates a reduction in the average high-temperature, down to an enjoyable 62.1°F (16.7°C) from August's agreeable 70.3°F (21.3°C). Kelly records a consistent low-temperature average of 37°F (2.8°C) during September, indicating a significant difference from the daytime heat.

Humidity

The average relative humidity in September in Kelly is 57%.

Rainfall

In Kelly, in September, it is raining for 12.2 days, with typically 1.97" (50mm) of accumulated precipitation. Throughout the year, there are 116.8 rainfall days, and 27.95" (710mm) of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 1.5 snowfall days, it receives 1.93" (49mm) of snow. Throughout the year, in Kelly, Wyoming, there are 130.7 snowfall days, and 137.48" (3492mm) of snow is accumulated.

Daylight

In Kelly, the average length of the day in September is 12h and 29min.
On the first day of the month, sunrise is at 6:47 am and sunset at 7:57 pm. On the last day of September, sunrise is at 7:19 am and sunset at 7:04 pm MDT.

Sunshine

In Kelly, Wyoming, the average sunshine in September is 10h.

UV index

In September, the average daily maximum UV index in Kelly is 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the average person.
Note: In September, the maximum UV index of 2 translates into these guidelines:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. To cut down UV radiation exposure by about half, sport a wide-brim hat. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
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Frequently asked questions

What is the usual temperature for Kelly in September?

The high-temperature, in September, in Kelly, is 62.1°F (16.7°C), while the low-temperature averages to 37°F (2.8°C).

What is the average humidity in September in Kelly?

In Kelly, Wyoming, the average relative humidity in September is 57%.

How much does it rain in Kelly in September?

In Kelly, Wyoming, in September, it is raining for 12.2 days, with typically 1.97" (50mm) of accumulated precipitation.

When does it start to snow in Kelly?

September is the first month it typically snows in Kelly, Wyoming. Throughout September, in the average 1.5 snowfall days, it receives 1.93" (49mm) of snow.

How many hours of daylight does Kelly have in September?

The average day length in September in Kelly, Wyoming, is 12h and 29min.

What time are sunrise and sunset in September in Kelly?

On the first day of September, sunrise is at 6:47 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:04 pm MDT.

How many hours of sunshine does Kelly have in September?

In Kelly, the average sunshine duration in September is 10h.

What is the UV index intensity in September in Kelly?

The average daily maximum UV index in September in Kelly is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Kelly, WY

Average temperature in September - Kelly, WY
  • Average high temperature in September: 62.1°F

The warmest month (with the highest average high temperature) is July (72°F).
The month with the lowest average high temperature is December (21°F).

  • Average low temperature in September: 37°F

The month with the highest average low temperature is July (43.9°F).
The coldest month (with the lowest average low temperature) is December (4.1°F).

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Average pressure in September
Kelly, WY

Average pressure in September - Kelly, WY
  • Average pressure in September: 29.99"Hg

The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in September
Kelly, WY

Average wind speed in September - Kelly, WY
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is June (5.8mph).
The calmest months (with the lowest average wind speed) are January and December (4.5mph).

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Average humidity in September
Kelly, WY

Average humidity in September - Kelly, WY
  • Average humidity in September: 57%

The month with the highest relative humidity is February (94%).
The month with the lowest relative humidity is August (50%).

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Average rainfall in September
Kelly, WY

Average rainfall in September - Kelly, WY
  • Average rainfall in September: 1.97"

The wettest month (with the highest rainfall) is February (3.23").
The driest month (with the least rainfall) is August (1.42").

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Average rainfall days in September
Kelly, WY

Average rainfall days in September - Kelly, WY
  • Average rainfall days in September: 12.2 days

The month with the highest number of rainy days is May (16.2 days).
The months with the least rainy days are January and February (3.9 days).

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Average snowfall in September
Kelly, WY

Average snowfall in September - Kelly, WY
  • Average snowfall in September: 1.93"

The month with the highest snowfall is February (25.94").
The months with the least snowfall are July and August (0").

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Average snowfall days in September
Kelly, WY

Average snowfall days in September - Kelly, WY
  • Average snowfall days in September: 1.5 days

The month with the highest number of snowfall days is December (21.7 days).
The month with the least snowfall days is July (0 days).

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Average daylight in September /
Average sunshine in September
Kelly, WY

Average daylight in September / Average sunshine in September - Kelly, WY
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in September: 10h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).

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Average sunshine days in September
Kelly, WY

Average sunshine days in September - Kelly, WY
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is July (15.6 days).
The month with the least sunshine days is April (7 days).

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Average UV index in September
Kelly, WY

Average UV index in September - Kelly, WY
  • Average UV index in September: 2

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 1).

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Average cloud cover in September
Kelly, WY

Average cloud cover in September - Kelly, WY
  • Average cloud cover in September: 20

The month with the most cloud cover is February (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 15).

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Average visibility in September
Kelly, WY

Average visibility in September - Kelly, WY
  • Average visibility in September: 6mi

The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January and February (2mi).

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Kelly, Wyoming, USA

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